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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba58cda7d0a24f5de4a0ca1299dddbd6564400c305c032eced4f26aecb6fb628' 
  AND token = '9EpJT60uUzKyAoSfpJFopNlHARIkOiu35gc0QB0QM9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}